How did Justin get to perform the Mariah classic “All I Want For Christmas?”

“She actually suggested it," The Biebs revealed. "We were going to do another song. I was going to ask her to do a song together for the Christmas album and she was like I actually have this new version I want to do of “All I Want For Christmas” and I think it would be great on your album. So we did it.”

Justin also explained how the whole thing came together.

“She had done it already, had done some parts on it. Then she sent it to me to do the second verses and then she went back in and did some other stuff on it.”

When Billy asked if they were ever together while recording, Justin answered, “no.”

Justin also talked about why he chose "Mistletoe" as his first single.

“It’s very fun. It’s a very fun Christmas song. A lot of people can relate to it.”

When Billy asked him why a Christmas album, Justin told him the ideas been floating around for awhile, but since his new album “Believe” wasn’t coming out for awhile, he found the time to do this special project!

“I’ll write some originals, we can do some covers and we were like yeah let’s do it.”